Cosmo and his pal Orbi were two brave martian astronauts going to Earth in search of intelligent life. They were launched in a space ship created by Prof. Thimk. However, they had a detour (thanks to a meteor) and landed on the moon. They landed on Earth and after a misadventure fled the planet. They went on more adventures with Cosmo's girlfriend, Astra. In each adventure, they visited a new planet and every story ended in a cliffhanger (including the last).